Vince,
You mentioned joining SecondStrike, great.
Have you looked into joining S.C.O.F. The owners forum. Would be well worth your time as it is a great group and you should be able to get info on your questions.
http://performanceunlimited.com/scof/subscribe.html
With ownership and car number you are all set. That's the complete price of admission.
Check it out, join the fun.
I have looked into some form of headrests. I have a full width roll bar and may build a bracket for the seatbelt mounts and may add head rests.
I have seen seatbelt mounts on the dual bar cars. I would think that a headrest could be placed there as well.
There may be a piece already out there ready to buy but I don't know who has it. Someone on SCOF may though.
Jim, SPF 1855, in Grand Rapids, MI